As far as other admins on iEra go I know some don't really respond to questions, but keep in my mind they might be dealing with issues that are reported through the feedback/report system, they might be hosting events or auctioning, being a PR/Admin is more than just answering PM's when you get them. I myself, try to answer every PM I get as I get them, but sometimes you will be very hard-pressed to contain the flood of messages, especially if you've made an announcement or are in a public place.
Mind you, I ignore the questions if they're like 'can I have a water-pistol?' or 'can you make me admin?'.